In June of 1925, almost a hundred years ago, Werner Heisenberg spent ten days on the island of Heligoland - thanks to his hayfever.  This respite afforded him the time to write an article that would mark the beginning of the history of modern quantum theory. Two years later, in October of 1927, the fifth Solvay Conference, arguably the most famous gathering in the history of physics, took place in Brussels, bringing the riveting story of the origins of quantum mechanics to a close. During this crucial and relatively short period between 1925 and 1927, eight physicists from five countries...